html,body{
      padding: 0;
      margin: 0;
      overflow: hidden;
      height: 100%;
      font-size: 12px;
    }
    canvas{
      background:#ccc;
    }
    .qcanvas_lay{
      height: 50%;
      position: relative;
      overflow: scroll;
    }
    .code_lay{
      height: 50%;
      overflow: scroll;
    }
a{
    background: #fff
  }
  ul{
    margin:0;
    padding: 0;
  }
  li{
    list-style-type: none
  }

pre {
    position: relative;
    border-radius: 3px;
    border: 1px solid #C3CCD0;
    background: #FFF;
    overflow: hidden;
}

code {
  display: block;
  padding: 12px 24px;
  overflow-y: auto;
  font-weight: 300;
  font-family: Menlo, monospace;
  font-size: 0.8em;
}

code.has-numbering {
    margin-left: 21px;
}

.pre-numbering {
    position: absolute;
    top: 0;
    left: 0;
    width: 20px;
    padding: 12px 2px 12px 0;
    border-right: 1px solid #C3CCD0;
    border-radius: 3px 0 0 3px;
    background-color: #EEE;
    text-align: right;
    font-family: Menlo, monospace;
    font-size: 0.8em;
    color: #AAA;
}